Hair drug testing: Many street drugs (or their breakdown products in the body) are absorbed into the hair. A sample of hair can be tested for recent drug use. Hair analysis: Testing of hair for toxic exposures, such as lead or mercury poisoning.
Gas Water Heater, water not hot enough-Thermostat or Sediment. The dip tube probably disintigrated. The dip tub sends cold water to the bottom of the tank for heating when its heated it rises to the top of the tank. Its possible that the dip tube broke of and now you have cold water mixing with the hot water on top.
An insufficient flow of water is usually the result of a blockage, and to remove it, you first have to locate it. A common cause of blockages in kitchen faucets is a build-up of mineral deposits, which can collect in the supply hose, the shutoff valve under the sink or the faucet valve. Single-handle faucets can have either a cartridge or ball valve, and both types of valves have ports that can get blocked. A good strategy for diagnosing low hot water flow is to begin looking for problems at the water heater and work toward the faucet valve. 1 Make sure that the hot water outlet valve on the water heater is open all the way by turning it counterclockwise as far as it will go. Check the hot water flow in other faucets in the house. If they also have low flow, and the water heater valve is open, there may be a restriction in the pipes near the water heater. This is more likely if the pipes are galvanized steel and old. The solution is to replace the pipes.